the Bud Powell school · ii–V–I in B♭ major
Shell Voicings in B♭ Major
The notes
| Chord | Notes (low → high) | Formula |
|---|---|---|
| Cm7 | C – B♭ | root · ♭7 |
| F7 | F – A | root · 3 |
| B♭maj7 | B♭ – A | root · 7 |
Why it works
From Cm7 to F7, 2 voices move (C3→F3, B♭3→A3) against 0 held tones. Into B♭maj7, 1 voice settles by step or small leap (total motion of just 7 semitones). Smoothness here is measurable, not a metaphor.
In B♭ major, 2 of the 6 notes fall on black keys — a mixed terrain that is exactly why this progression must be practiced in every key, not just C. The lowest note is B♭2 in the low register; below roughly C3, close intervals start to blur, and this voicing stays clear of that line.
Practice tip: play the progression rubato first and listen for the held tones, then put the metronome on 2 and 4 at a slow tempo. When the grab is automatic, move around the circle of fourths — you are coming from F and headed to E♭. Say the chord symbols out loud as you play; naming and hearing are different skills, and you want both.
Where B♭ major lives in the repertoire
B♭ major is the horn key: rhythm changes ("I Got Rhythm" and its hundred contrafacts) live here, and so does a large share of the blues repertoire. A jobbing pianist probably plays more ii–V–Is in B♭ than in any key except E♭ — this page is core curriculum, not a variation.
About this voicing style
Two notes per chord — root plus 3rd or 7th. The bebop left hand. Read the full story and get it in all 12 keys →
Listen: Bud Powell — "Celia"; Thelonious Monk's left hand on "Straight, No Chaser".
Around the circle
Practice keys in the order bassists walk them — up a fourth: ← F · B♭ · E♭ →